Line one or two: Escape velocity.
Line three: Space vehicle's orbit may be determined.
Line four: Equation for the perigee radius Rp.
Line five: From which the eccentricity of the orbit can be calculated.
Line six: To pin down a satellite's orbit in space, need to know the angle from the perlapsis point to the launch point.
Line seven: The drag FD on a body is calculated by the equation.
Line eight: Mach number is given by.
Line nine: c is the acoustic velocity and is calculated by the equation k is the specific heat ration equal to 1.40 R is the gas constant equal to 1,715 ft-lb/slug-R
Line ten: Thrust.
Line eleven: momentum, of a particle is the product of its mass and its velocity.
Line twelve: Second law of motion.